钢管再生混凝土轴压构件的力学性能分析  

Mechanical performance analysis on RACFST under axial compression

作　　者：徐金俊[1] 陈宗平[1,2] 陈宇良[1] 

机构地区：[1]广西大学土木建筑工程学院,南宁530004 [2]广西大学工程防灾与结构安全教育部重点实验室,南宁530004

出　　处：《应用力学学报》2015年第6期979-984 1102,共7页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(50908057;51268004);广西自然科学基金(2012GXNSFAA053203;2013GXNSFDA019025);广西科技攻关项目(桂科攻12118023-3);广西理工科学实验中心重点项目(LGZX201102)

摘　　要：为了研究钢管再生混凝土构件在轴心荷载作用下的力学性能演化规律,以再生粗骨料取代率、高宽比、截面形式为变化参数,完成了16个试件的轴心受压试验;在此基础上,获取了轴压荷载-位移曲线,并首次分析了试验参数对试件能量耗散、变形延性、刚度指标的影响。研究结果表明:方形试件与圆形试件在轴压荷载-位移曲线上的最大区别为前者具有明显的峰值尖点;随着再生粗骨料取代率的增加,短柱试件的耗能能力下降,圆钢管中长柱试件的耗能能力得到提高,方钢管中长柱试件的耗能能力具有先降后升趋势,而延性系数则保持增长;随着高宽比的增加,圆钢管再生混凝土构件的轴压耗能具有减增减的趋势,而方钢管再生混凝土柱的轴压耗能具有稳步减小的趋势,中长柱试件的延性系数总体呈现下降趋势;钢管再生混凝土试件的相对弹性刚度随取代率的增加而增大。In order to study the mechanical performance evolution of RACFST members under axial compression, sixteen specimens are tested according to the parameters of recycled coarse aggregate(RCA) replacement ratio and height-width ratio. Based on the tests, the axial compression load-displacement curves are obtained and the influences of test parameters on the energy dissipation, deformation ductility and stiffness of specimens are analyzed. Results obtained show that the biggest difference of load-displacement curves between circular and square specimens is that the peak point is very sharp in the curves of square specimens. With the increasing of RCA replacement ratio, the energy-dissipating capacity of short column specimens is reduced, while the energy-dissipating capacity of medium length circle steel tube specimens is enhanced, and the trend of energy-dissipating capacity for medium length square steel tube specimens is firstly reduced and then raised, moreover, the deformation ductility of all specimens keeps increasing. With the increasing of height-width ratio, the axial compression energy dissipation of RACFCST keeps a trend of reduction-increase-decrease, while the axial compression energy dissipation of RACFSST is reduced. In addition, the ductility coefficient of medium length specimens keeps declining as a whole. With the increasing of RCA replacement ratio, the relative elastic stiffness of RACFT keeps increasing.

关 键 词：再生混凝土 圆钢管 方钢管 取代率 耗能 延性 刚度 

分 类 号：TU398.9[建筑科学—结构工程]